in biology, a metaphorical expression proposed by C. Darwin (1859) to describe an organism’s activity directed at preserving life and providing for the existence of offspring. The concept of the struggle for life is closely related to natural selection. In the most general sense, the struggle...
Competition in biology: It’s a scoop! Nature - Pearson - 2003 () Citation Context ...els, predictions, explanations, and meta-level content, and informatics technology can support these intentions, but researchers also want to retain certain information to retain an edge over others (=-=...
In the three–spined stickleback Gasterosteus aculeatus, male red breeding coloration plays a dual role in sexual selection by functioning as both a threat signal in male–male competition and as a cue for female choice. To investigate whether male competition determines the level of signalling, ...
Specifically, men who win a competitive task show higher preferences for facial femininity, a putative cue to women’s mate quality (e.g., Thornhill & Gangestad, 1999), than men who lose. It is possible that increases in men’s testosterone level are driving these effects, perhaps by ...
Parker,A G.摘要: Evolutionary games of sperm competition in which two males mate with the same female have previously considered sperm size to be fixed at some (small) constant level. Although male gametes in multicellular organisms are typically small compared with ova, they vary greatly both ...
[17]. This is especially true for insects, in which polyandry seems to be the rule, rather than the exception. The importance of sperm competition in social insects has been studied in some detail, albeit more on a theoretical level rather than through extensive empirical work [4,8,9]. ...
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A basic prediction in the biology of mating systems is that males of species with more intense sperm competition will have larger testes. The evolutionary responsiveness of testicular size to sperm competition is an important example of the effects of sexual selection on morphology and anatomy. ...
A study on the reproductive biology of aquatic Utricularia species in southwestern Japan male sterilityself-pollinationcleistogamyLife cycle of six species of Utricularia was studied in the Kinki District, southwestern Japan, with special reference ... I Yamamoto,Y Kadono - 《Acta Phytotaxonomica Et ...
The lack of any detectable advantage to elevated prenatal invest- ment is surprising, and may reflect a high level of noise associated with high pup mortality due to intra- or inter- group infanticide and predation18,19. It may also be that the benefits of increased prenatal investment are ...